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From Mag Gam <magaw...@gmail.com>
Subject Re: decommission a rack
Date Thu, 06 Jan 2011 02:24:57 GMT
Thanks for the response.

I did decommission the server and it took couple of minutes. However,
I see the server in my "Dead Datanotes" page. How can I completely
forget about this box?

On Wed, Jan 5, 2011 at 10:01 AM, Segel, Mike <msegel@navteq.com> wrote:
> Change your topology script?
> One thing about rack awareness. You never want to have an unbalanced configuration. The
caveat is if your uplinks between the ToR Switch  are 'fat' enough. (4 10GBe should do it.)
> If you watched your system with the one machine on a separate rack (assuming it was also
on a separate switch) you'd see a major network bottle neck. (We use Ganglia)
> If you're seeing the rack count wrong, you could just bounce the cloud and it should
show only two.
> Note: Deprecating a machine can take a long time. You may want to consider just killing
the node, waiting till the cluster recognizes that its down and I believe just kicking off
an FSCK or maybe running the balancer program will clean that up faster than deprecating.
> -Mike
> -----Original Message-----
> From: Mag Gam [mailto:magawake@gmail.com]
> Sent: Wednesday, January 05, 2011 5:56 AM
> To: general@hadoop.apache.org
> Subject: decommission a rack
> Using 0.21
> I have a server which was in rack3. It was the only server in this
> rack so I decommissioned the server. fsck shows only 2 racks however
> topology shows 3 racks. How can I fix this?
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